The best things about this condo are its location and the responsiveness and flexibility of Bud, the owner. It's right next to the Thonglor BTS station, with a covered passageway running right into the building, so even in the middle of one of Bangkok's epic heavy downpours, you stay dry and get to the train quickly and easily. And Bud allowed me to stay on my departure day a few hours longer because of my flight time, which made all the difference.
Along with such a convenient location, you do get a lot of street and train noise, so I used earplugs at night, but that was a small compromise for the benefits of this clean and convenient basecamp for your Bangkok explorations.